Bootstrap Navar à haut niveau
<nav class="navbar navbar-expand-sm bg-light fixed-top">
Wide-eyed Wolf
<nav class="navbar navbar-expand-sm bg-light fixed-top">
<section id="headnev" class="navbar navbar-fixed-top">
<nav class="navbar fixed-top navbar-light bg-light">
<a class="navbar-brand" href="#">Fixed top</a>
</nav>